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If you disabled Legacy boot mode and you can't boot the USB installation disk, It hasn't been assembled right. What tool did you use to make the USB installation disk?
Use Rufus Rufus - Create bootable USB drives the easy way and get the iso from here: Microsoft Windows and Office ISO Download Tool
As you said that your laptop came without OS and the HPDoc you already deleted, there is nothing more to loose.
Just in case, make a new partition leaving the system partition with 200M.
Install Win 7 on the remaining partition. Windows will create the appropriate partitions.
As your hardware is new, UEFI mode it's more appropriate to install Win 7 64.
Follow the steps on my previous post (10).

I'm using rufus again to make the usb bootable, and it offers me three options. "mbr for bios or uefi-csm" "mbr for bios" or "gpt for uefi"

If I choose gpt for uefi, it sets the field below to FAT32 as default. Is NTFS compatible with "gpt for uefi"?
And should I set it to 4gb or 8 gb?

Edit: The process of making the USB bootable was considerably slower than usual. I've disabled legacy mode and this time it showed option to boot from USB. But again, everything was considerably slower, until it completely freezed during the "starting windows" screen with the logo appearing.

On a Legacy - MBR, on boot, BIOS takes to MBR that will point to a Master Boot Loader. If you have more than one OS on the disk, this Master Boot Loader will have a option on what OS you want to boot. It then takes the boot to the OS boot loader.

On a UEFI - GPT, on boot, Bios takes to a UEFI Fat32 partition (100M) where can be many boot loaders, one for each OS. There is no MBR or Master Boot Loader.
The main difference is that on a On a Legacy - MBR you choose from what disk you want to boot from and on a UEFI - GPT you choose from what boot loader you want to boot from (that are on the UEFI Fat32 partition).
Each OS has it's own file system. Windows will have NTFS, Linux will have Ext4 etc)
The reason to have UEFI as Fat32 it is because it is recognized by all OS's.
As UEFI is the up to date "BIOS", some hardware works better under it.
As you have a UEFI BIOS and Win 7 64 is compatible, I would install as UEFI - GPT.

On a Legacy - MBR, on boot, BIOS takes to MBR that will point to a Master Boot Loader. If you have more than one OS on the disk, this Master Boot Loader will have a option on what OS you want to boot. It then takes the boot to the OS boot loader.

On a UEFI - GPT, on boot, Bios takes to a UEFI Fat32 partition (100M) where can be many boot loaders, one for each OS. There is no MBR or Master Boot Loader.
The main difference is that on a On a Legacy - MBR you choose from what disk you want to boot from and on a UEFI - GPT you choose from what boot loader you want to boot from (that are on the UEFI Fat32 partition).
Each OS has it's own file system. Windows will have NTFS, Linux will have Ext4 etc)
The reason to have UEFI as Fat32 it is because it is recognized by all OS's.
As UEFI is the up to date "BIOS", some hardware works better under it.
As you have a UEFI BIOS and Win 7 64 is compatible, I would install as UEFI - GPT.

So I'm guessing the fact that I chose to make it bootable in NTFS is the reason why it doesn't work.
Also isn't FAT32 inferior to NTFS? What exactly am I losing by using FAT32 instead of NTFS?

The reason to have UEFI as Fat32 it is because it is recognized by all OS's.
If you follow this steps you're going to have Win 7 64 bits installed.
- Format your USB flash drive as Fat 32 (default)
- Extract all files from the Win 7 64 bits iso to the USB flash drive.
- Add the efi/boot folder that I've provided on post 14 to the USB flash drive.
- On the laptop, set Legacy support and Secure boot to disabled.
- Boot from the USB flash drive. (it will only boot as UEFI as there is no MBR on it)
- Go to install - advanced and click on the System partition.
- Click New - Select size as 920G. It will create a RAW partition.
- Click on the 920G RAW partition and click install or next.
That's it.

The reason to have UEFI as Fat32 it is because it is recognized by all OS's.
If you follow this steps you're going to have Win 7 64 bits installed.
- Format your USB flash drive as Fat 32 (default)
- Extract all files from the Win 7 64 bits iso to the USB flash drive.
- Add the efi/boot folder that I've provided on post 14 to the USB flash drive.
- On the laptop, set Legacy support and Secure boot to disabled.
- Boot from the USB flash drive. (it will only boot as UEFI as there is no MBR on it)
- Go to install - advanced and click on the System partition.
- Click New - Select size as 920G. It will create a RAW partition.
- Click on the 920G RAW partition and click install or next.
That's it.

But FAT32 systems have a 4gb file limit? Why would anyone want to choose that option?

Also I'm guessing I have to convert the drive to GPT if it already isn't, but there's no way of doing that when I can't reach the stage where you can open CMD

- Format your USB flash drive as Fat 32 (default)
I'm talking about creating the Win 7 installation USB flash disk, not the HDD.
Please, just do what I wrote above and you're going to have your Win 7 installed as UEFI and your windows C drive will be formatted as NTFS.

- Format your USB flash drive as Fat 32 (default)
I'm talking about creating the Win 7 installation USB flash disk, not the HDD.
Please, just do what I wrote above and you're going to have your Win 7 installed as UEFI and your windows C drive will be formatted as NTFS.

Alright. So as soon as I have the option to go into cmd I convert the disk to gpt?

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